High-frequency acoustic scattering from turbulent oceanic microstructure : the importance of density fluctuations


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dc.contributor.author Lavery, Andone C.
dc.contributor.author Schmitt, Raymond W.
dc.contributor.author Stanton, Timothy K.
dc.date.accessioned 2008-10-22T15:39:45Z
dc.date.available 2008-10-22T15:39:45Z
dc.date.issued 2003-11
dc.identifier.citation Journal of the Acoustical Society of America 114 (2003): 2685-2697 en
dc.identifier.uri http://hdl.handle.net/1912/2523
dc.description Author Posting. © Acoustical Society of America, 2003. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 114 (2003): 2685-2697, doi:10.1121/1.1614258. en
dc.description.abstract Acoustic scattering techniques provide a unique and powerful tool to remotely investigate the physical properties of the ocean interior over large spatial and temporal scales. With high-frequency acoustic scattering it is possible to probe physical processes that occur at the microstructure scale, spanning submillimeter to centimeter scale processes. An acoustic scattering model for turbulent oceanic microstructure is presented in which the current theory, which only accounts for fluctuations in the sound speed, has been extended to include fluctuations in the density as well. The inclusion of density fluctuations results in an expression for the scattering cross section per unit volume, σv, that is explicitly dependent on the scattering angle. By relating the variability in the density and sound speed to random fluctuations in oceanic temperature and salinity, σv has been expressed in terms of the temperature and salinity wave number spectra, and the temperature-salinity co-spectrum. A Batchelor spectrum for temperature and salinity, which depends on parameters such as the dissipation rates of turbulent kinetic energy and temperature variance, has been used to evaluate σv. Two models for the temperature-salinity co-spectrum have also been used. The predictions indicate that fluctuations in the density could be as important in determining backscattering as fluctuations in the sound speed. Using data obtained in the ocean with a high resolution vertical microstructure profiler, it is predicted that scattering from oceanic microstructure can be as strong as scattering from zooplankton. en
dc.description.sponsorship This work was supported in part by ONR, NSF, and the Woods Hole Oceanographic Institution. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Acoustical Society of America en
dc.relation.uri http://dx.doi.org/10.1121/1.1614258
dc.subject Acoustic wave scattering en
dc.subject Underwater acoustic propagation en
dc.subject Oceanography en
dc.subject Remote sensing en
dc.subject Oceanographic techniques en
dc.title High-frequency acoustic scattering from turbulent oceanic microstructure : the importance of density fluctuations en
dc.type Article en
dc.identifier.doi 10.1121/1.1614258

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